| Long-pipe space of high-way tunnel induce the severe air pollution, widely different brightness between in and out of the cavity, narrow traffic space and the difficulty to fire fighting in it, which bring about hidden trouble of security in tunnel traffic, however, the tunnel fire is the most dangerous. Establishing perfect tunnel fireproofing establishment is a significant work, which could put out the generated fire in its germination or developing initial stages minimizing the disaster loss. The fire alarm monitoring system could automatically monitor tunnel space every time and every where without clearance and false interruption, which must be credible, advance and has the characteristic of high sensitivity and low misinformation.In nearly several years, FBG sensor is the hotspot of research in the field of fiber sense technology and the powerful competitor in strain and temperature measurement for its many advance better than traditional sensor. FBG temperature sensing monitor system employing FBG sensors is applied in the field of tunnel fire alarm monitor, which is one of the innovations in this paper, and has been widely applied in many trades such as petrochemical, electric power, metallurgy, architecture and communication etc.Based on the all-around understanding actual studies in the field of tunnel fire, analyzing the existing tunnel fire alarm monitoring system, a new type of system that employs FBG temperature sensing detector is proposed and is designed in several aspect of detector, software and control system. The field experiment is done in 1:1 tunnel and the experimental data is analyzed, the contributions of this paper are:1) FBG temperature sensing system was applied in the field of tunnel fire alarm monitoring in which the actual studies and existing technique were analyzed, and the feasibility was studied.2) The applicable FBG temperature sensing detector aiming is designed at the characteristic of this field, the software is designed according to the requirement of data processing and system alarm, the centralized alarm controller and regional alarm controller is designed according to the design criterion.3) This system was installed and debugged in the 1:1 experimental tunnel on Chongqing Communications Research and Design Institute Tunnel and TrafficEngineering Department, and the simulative fire alarm monitoring experiment was done.4) According to experimental data and spot status, the dynamic characteristic in temperature rise and temperature field distribution were analyzed and the performance of differently encapsulated detector was compared.In the experiment, the fastest alarm time to 0.5m2 fire of this system is 6s and the efficient alarm range is ± 20m in 30s, which absolutely testify the feasibility of this system in the field of tunnel fire alarm. The two different encapsulated sensors should be chose applicably aiming at practice engineering, armored sensor having better stability than soft-encapsulated sensor does, at the same time the later having faster respond time than the former does. This experimental data provide valuable information for analyzing tunnel fire initial stage and the next-step research or engineering application.
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